GRAPEVINE
🍇В изначальном смысле grapevine — это виноградная лоза
🍇В контексте видео — слухи, сарафанное радио, сеть информаторов (an informal way in which information is shared in a group of people)

▫️I heard through the grapevine that they fired him – is that true?
▫️We hear on the grapevine that the companies are discussing a merger

Отсюда выражение:
🍇hear (sth) through/on the grapevine = to hear news from someone who heard the news from someone else

Интересное происхождение этой фразы, связанное с телеграфными проводами, протянувшимися как виноградная лоза:

The term originated in the USA and comes from the telegraph system invented in the 19th century by Samuel Morse. The system required thousands of kilometres of telegraph wire to be installed, held in place several meters above the ground by telegraph poles placed at regular intervals along the telegraph route. People thought the wires and poles looked like the strings used to train vines so the telegraph lines became known as ‘the grapevine’. During the American Civil War rumours were often spread via the telegraph lines. When people were asked whether a particular story was true, they would often reply ‘I heard it through the grapevine’.

🎶И, как заметили в комментариях, есть такая песня: Marvin Gaye - I Heard It Through The Grapevine
https://www.youtube.com/watch?v=BYFt1P6C6ngh